Examine source code of Shipping Center Icon

{
  "manifest_version": 2,
  "name": "Shipping Center Icon",
  "version": "1.0",
  "description": "Shipping center logos are often simple, recognizable, and convey a message about shipping, distribution, and logistics.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb125713-b88e-4f9f-a165-4862075d1875}"
    }
  }
}